Concept:The slope of a velocity-time graph measures the rate of change of velocity, which is acceleration.
Explanation:Acceleration is the change in velocity per unit time.
For a velocity-time graph, slope
=ΔtΔv.
This ratio is exactly the definition of acceleration.
Since the graph is a straight line, the slope is constant.
A constant slope means the acceleration is constant, or uniform.
Therefore, a straight-line velocity-time graph represents uniform acceleration.
Answer:A. uniform acceleration